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<div class="toc"><dl class="toc">
<dt><span class="section"><a href="appendices.html#chrono.appendices.history">Appendix: History</a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.rationale">Appendix: Rationale</a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.implementation">Appendix: Implementation
      Notes</a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.faq">Appendix: FAQ</a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.acknowledgements">Appendix: Acknowledgements</a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.todo">Appendix: Future plans</a></span></dt>
</dl></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="chrono.appendices.history"></a><a class="link" href="appendices.html#chrono.appendices.history" title="Appendix: History">Appendix: History</a>
</h3></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_2_0_8____2018___1_70__"><span class="bold"><strong>Version 2.0.8, , 2018 - 1.70</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_2_0_7__august_18__2016___1_62__"><span class="bold"><strong>Version 2.0.7, August 18, 2016 - 1.62</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_2_0_6__december_18__2015___1_60__"><span class="bold"><strong>Version 2.0.6, December 18, 2015 - 1.60</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_2_0_5__february_18__2015___1_58__"><span class="bold"><strong>Version 2.0.5, February 18, 2015 - 1.58</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_2_0_4__july_12__2014___1_56__"><span class="bold"><strong>Version 2.0.4, July 12, 2014 - 1.56</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_2_0_3__september_29__2013___1_55__"><span class="bold"><strong>Version 2.0.3, September 29, 2013 - 1.55</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_2_0_2__june_15__2013___1_54__"><span class="bold"><strong>Version 2.0.2, June 15, 2013 - 1.54</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_2_0_1__january_18__2013___1_53__"><span class="bold"><strong>Version 2.0.1, January 18, 2013 - 1.53</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_2_0_0__october_23__2012___1_52__"><span class="bold"><strong>Version 2.0.0, October 23, 2012 - 1.52</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_1_2_3__august_1__2012___1_51__"><span class="bold"><strong>Version 1.2.3, August 1, 2012 - 1.51</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_1_2_2__april_1__2012___1_50__"><span class="bold"><strong>Version 1.2.2, April 1, 2012 - 1.50</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_1_2_1__february_1__2012___1_49__"><span class="bold"><strong>Version 1.2.1, February 1, 2012 - 1.49</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_1_2_0__october_17__2011__"><span class="bold"><strong>Version 1.2.0, October 17, 2011</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_1_1_0__mars_17__2011__"><span class="bold"><strong>Version 1.1.0, Mars 17, 2011</strong></span> </a></span></dt>
<dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_1_0_0__january_6__2011__"><span class="bold"><strong>Version 1.0.0, January 6, 2011</strong></span> </a></span></dt>
</dl></div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_2_0_8____2018___1_70__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_2_0_8____2018___1_70__" title="Version 2.0.8, , 2018 - 1.70"><span class="bold"><strong>Version 2.0.8, , 2018 - 1.70</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
              Remove Stopwatches, which was never be delivered officially.
            </li></ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_2_0_7__august_18__2016___1_62__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_2_0_7__august_18__2016___1_62__" title="Version 2.0.7, August 18, 2016 - 1.62"><span class="bold"><strong>Version 2.0.7, August 18, 2016 - 1.62</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/11630" target="_top">#11630</a>
              boost chrono documentation about boost chrono version &amp; io API
              is wrong.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/12176" target="_top">#12176</a>
              Chrono without linking to Boost.System
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/12260" target="_top">#12260</a>
              Bug: time_fmt does not support for wchar_t on windows
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_2_0_6__december_18__2015___1_60__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_2_0_6__december_18__2015___1_60__" title="Version 2.0.6, December 18, 2015 - 1.60"><span class="bold"><strong>Version 2.0.6, December 18, 2015 - 1.60</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/11330" target="_top">#11330</a>
              boost::chrono::duration default constructor doesn't initialize rep_
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/11618" target="_top">#11618</a>
              Chrono IO V2 doc ios_state.hpp does not exist
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/11631" target="_top">#11631</a>
              boost chrono io v2 does not let you support custom clocks
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_2_0_5__february_18__2015___1_58__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_2_0_5__february_18__2015___1_58__" title="Version 2.0.5, February 18, 2015 - 1.58"><span class="bold"><strong>Version 2.0.5, February 18, 2015 - 1.58</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/10778" target="_top">#10778</a>
              VC14 CTP4 Atomic don't compile with boost::chrono durations which are
              not TriviallyCopyable
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/10840" target="_top">#10840</a>
              Missing std:: qualifier for puts call in test_7868.cpp
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/10851" target="_top">#10851</a>
              Missing std:: qualifier for puts call in time_point_output.cpp
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/10893" target="_top">#10893</a>
              Minor doc typo in Boost.Chrono
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/10992" target="_top">#10992</a>
              Chrono IO state savers inconsistent with Boost.IO state savers
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/10995" target="_top">#10995</a>
              duration_put::put_value truncates fractional part
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/11006" target="_top">#11006</a>
              Impossible to instantiate time_fmt_io_saver due to several errors.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/11012" target="_top">#11012</a>
              chrono_io v2 fail to compile with boost::chrono::duration&lt; boost::rational&lt;int&gt;
              &gt;
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_2_0_4__july_12__2014___1_56__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_2_0_4__july_12__2014___1_56__" title="Version 2.0.4, July 12, 2014 - 1.56"><span class="bold"><strong>Version 2.0.4, July 12, 2014 - 1.56</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6918" target="_top">#6918</a>
              Boost Chrono compilation failure on HP uX due to undefined pthread_getcpuclockid
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/8006" target="_top">#8006</a>
              Boost::Chrono Assertion at startup - steady_clock::now() - Windows
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9337" target="_top">#9337</a>
              chrono::process_cpu_clock time points wrong by factor 1000 on Linux
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9342" target="_top">#9342</a>
              Regression on process_cpu_clock::timepoint io on V2
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9419" target="_top">#9419</a>
              boost::chrono::floor()/round() and negative durations is wrong
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9698" target="_top">#9698</a>
              boost::chrono::thread_clock not declared in OSX
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9720" target="_top">#9720</a>
              boost::this_thread::sleep_for() sometimes returns immediately on win32
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9859" target="_top">#9859</a>
              Remove references to gcc-mingw
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9918" target="_top">#9918</a>
              chrono compilation error on Solaris, function timegm
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9811" target="_top">#9811</a>
              boost/boost/chrono/duration.hpp:355:56: error: call to non-constexpr
              function 'static std::numeric_limits&lt;float&gt;::_Ty std::numeric_limits&lt;float&gt;::max()'
              /home/zosun/input_service/inputservices-core-service/other/boost/boost/chrono/duration.hpp:
              In static member function 'static constexpr double boost::chrono::detail::chrono_numeric_limits&lt;double,
              true&gt;::lowest()':
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/10069" target="_top">#10069</a>
              Overflow in chrono clocks on 32bit
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/10151" target="_top">#10151</a>
              timegm function not available on QNX
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_2_0_3__september_29__2013___1_55__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_2_0_3__september_29__2013___1_55__" title="Version 2.0.3, September 29, 2013 - 1.55"><span class="bold"><strong>Version 2.0.3, September 29, 2013 - 1.55</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7868" target="_top">#7868</a>
              chrono_io parses time incorrectly (1.53 and 1.52)
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9028" target="_top">#9028</a>
              Typo in boost/chrono/stopwatches/formatters/base_formatter.hpp
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9147" target="_top">#9147</a>
              uninitialized std::tm
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9274" target="_top">#9274</a>
              lost of precision on system_clock input.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/9276" target="_top">#9276</a>
              output from a system_clock::time_point get a time_point that is one
              day later than expected.
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_2_0_2__june_15__2013___1_54__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_2_0_2__june_15__2013___1_54__" title="Version 2.0.2, June 15, 2013 - 1.54"><span class="bold"><strong>Version 2.0.2, June 15, 2013 - 1.54</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/8079" target="_top">#8079</a>
              Chrono memory leak
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/8318" target="_top">#8318</a>
              BOOST_FORCEINLINE constructors of time_point and duration
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/8367" target="_top">#8367</a>
              chrono does not compile with clang from XCode 4.5.2 with -std=c++11
              -stdlib=libc++ and -arch armv7
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/8370" target="_top">#8370</a>
              typo in chrono reference
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/8435" target="_top">#8435</a>
              Can't compile Chrono on HP-UX due to no CLOCK_REALTIME macro.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/8690" target="_top">#8690</a>
              duration_units_default - lost return types constness in overridden
              methods.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/8691" target="_top">#8691</a>
              iostate is not checked after scan_keyword call.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/8696" target="_top">#8696</a>
              chrono compilation error on Solaris/gcc.
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_2_0_1__january_18__2013___1_53__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_2_0_1__january_18__2013___1_53__" title="Version 2.0.1, January 18, 2013 - 1.53"><span class="bold"><strong>Version 2.0.1, January 18, 2013 - 1.53</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Deprecated:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              The chrono i/o version included in Boost.Chrono 1.2.x has been completly
              refactored in version 2.0.0
            </li>
<li class="listitem">
              chrono I/O: The manipulators <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.manipulators" title="I/O Manipulators"><code class="computeroutput"><span class="identifier">duration_short</span></code></a>, <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.manipulators" title="I/O Manipulators"><code class="computeroutput"><span class="identifier">duration_long</span></code></a> are deprecated.
              You should use the parameterized form <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt" title="Template Class duration_fmt"><code class="computeroutput"><span class="identifier">duration_fmt</span></code></a> or the renamed
              manipulators __duration_symbol and __duration_prefix instead.
            </li>
<li class="listitem">
              chrono I/O: The <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a>&lt;&gt; facet
              is deprecated. You should use the <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.get_duration_style" title="Non Member Function get_duration_style(std::ios_base &amp;)"><code class="computeroutput"><span class="identifier">get_duration_style</span></code></a> free function
              to get the informations and use the <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units" title="Template Class duration_units"><code class="computeroutput"><span class="identifier">duration_units</span></code></a> facet for localization
              purposes.
            </li>
</ul></div>
<p>
          When BOOST_CHRONO_VERSION==2 the preceding deprecated functions are not
          available.
        </p>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7546" target="_top">#7546</a>
              time_point&lt;system_clock&gt; output version 2 fails to compile assigned
              viboes Bugs Boost 1.53.0 --
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7547" target="_top">#7547</a>
              time_point&lt;system_clock&gt; input version 2 fails to compile assigned
              viboes Bugs Boost 1.53.0 --
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7868" target="_top">#7868</a>
              chrono_io parses time incorrectly (1.53 and 1.52)
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_2_0_0__october_23__2012___1_52__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_2_0_0__october_23__2012___1_52__" title="Version 2.0.0, October 23, 2012 - 1.52"><span class="bold"><strong>Version 2.0.0, October 23, 2012 - 1.52</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>New Features:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
              Enhance chrono I/O
              <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem">
                    <a href="http://svn.boost.org/trac/boost/ticket/5980" target="_top">#5980</a>
                    Enhance chrono I/O with H. Hinnant proposal <a href="http://home.roadrunner.com/~hinnant/bloomington/chrono_io.html" target="_top">proposal</a>
                    which has the advantage to provide I/O for system clocks using
                    the Gregorian Calendar.
                  </li>
<li class="listitem">
                    <a href="http://svn.boost.org/trac/boost/ticket/5981" target="_top">#5981</a>
                    Add i/o state savers for duration and time_point formatting state.
                  </li>
<li class="listitem">
                    <a href="http://svn.boost.org/trac/boost/ticket/7059" target="_top">#7059</a>
                    Add low level i/o facilities.
                  </li>
</ul></div>
            </li></ul></div>
<p>
          <span class="bold"><strong>Deprecated:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              The chrono i/o version included in Boost.Chrono 1.2.x has been completly
              refactored in version 2.0.0
            </li>
<li class="listitem">
              chrono I/O: The manipulators <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.manipulators" title="I/O Manipulators"><code class="computeroutput"><span class="identifier">duration_short</span></code></a>, <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.manipulators" title="I/O Manipulators"><code class="computeroutput"><span class="identifier">duration_long</span></code></a> are deprecated.
              You should use the parameterized form <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt" title="Template Class duration_fmt"><code class="computeroutput"><span class="identifier">duration_fmt</span></code></a> or the renamed
              manipulators __duration_symbol and __duration_prefix instead.
            </li>
<li class="listitem">
              chrono I/O: The <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a>&lt;&gt; facet
              is deprecated. You should use the <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.get_duration_style" title="Non Member Function get_duration_style(std::ios_base &amp;)"><code class="computeroutput"><span class="identifier">get_duration_style</span></code></a> free function
              to get the informations and use the <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units" title="Template Class duration_units"><code class="computeroutput"><span class="identifier">duration_units</span></code></a> facet for localization
              purposes.
            </li>
</ul></div>
<p>
          When BOOST_CHRONO_VERSION==2 the preceding deprecated functions are not
          available.
        </p>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7381" target="_top">#7381</a>
              C++11 compliance: unresolved symbol when assigning a constexpr duration
              to a non-const local variable.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7479" target="_top">#7479</a>
              Compiles fails with compilers supporting constexpr fails if the standard
              library doesn't provides the constexpr interface
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7493" target="_top">#7493</a>
              compile fail on intel-linux-12.1.3.0x because of bug on explicit bool
              conversion
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7542" target="_top">#7542</a>
              Missing -lpthread in chrono/io tester Sandia-clang-trunk
            </li>
</ul></div>
<p>
          <span class="bold"><strong>Would not fix:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6871" target="_top">#6871</a>
              chrono_io.hpp: operator&lt;&lt;(ostream&amp; os, ...) modifies the
              state of os.
              <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "><li class="listitem">
                    The new io interface provided in version 2 solves this issue.
                    You should move to the new version.
                  </li></ul></div>
            </li></ul></div>
<p>
          <span class="bold"><strong>Known bugs not fixed yet:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7525" target="_top">#7525</a>
              Wrong clock_string&lt;system_clock&gt;::since() on Windows
            </li></ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_1_2_3__august_1__2012___1_51__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_1_2_3__august_1__2012___1_51__" title="Version 1.2.3, August 1, 2012 - 1.51"><span class="bold"><strong>Version 1.2.3, August 1, 2012 - 1.51</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6918" target="_top">#6918</a>
              Boost Chrono compilation failure on HP uX due to undefined pthread_getcpuclockid.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6241" target="_top">#6241</a>
              boost::chrono compilation problems without std::wstring support.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6987" target="_top">#6987</a>
              Documentation &amp; C++11.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7041" target="_top">#7041</a>
              time_point.hpp depends on Boost.System.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7042" target="_top">#7042</a>
              Avoiding time_point and duration dependency on time.h and CLOCK_REALTIME.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7058" target="_top">#7058</a>
              Make it work when BOOST_NO_EXCEPTIONS is defined.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7069" target="_top">#7069</a>
              Misspellings in clock_string&lt;thread_clock&gt;.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/7081" target="_top">#7081</a>
              WinError.h capitalization in boost/detail/win/basic_types.hpp.
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_1_2_2__april_1__2012___1_50__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_1_2_2__april_1__2012___1_50__" title="Version 1.2.2, April 1, 2012 - 1.50"><span class="bold"><strong>Version 1.2.2, April 1, 2012 - 1.50</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6361" target="_top">#6361</a>
              integer overflow in boost::chrono::process_real_cpu_clock::now() under
              Windows 32bits.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6628" target="_top">#6628</a>
              compiler warning in process_cpu_clocks.hpp.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6666" target="_top">#6666</a>
              thread_clock.hpp needs pthread.h.
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_1_2_1__february_1__2012___1_49__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_1_2_1__february_1__2012___1_49__" title="Version 1.2.1, February 1, 2012 - 1.49"><span class="bold"><strong>Version 1.2.1, February 1, 2012 - 1.49</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6092" target="_top">#6092</a>
              Input from non integral durations makes the compiler fail.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6093" target="_top">#6093</a>
              [1/3]second fails as valid duration input.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6113" target="_top">#6113</a>
              duplicate symbol when BOOST_CHRONO_HEADER_ONLY is defined.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6243" target="_top">#6243</a>
              Sandia-pgi-11.9: more than one instance of overloaded function "min"
              matches.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/6257" target="_top">#6257</a>
              process_cpu_clock::now() on linux gives time_points 1/1000 times.
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_1_2_0__october_17__2011__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_1_2_0__october_17__2011__" title="Version 1.2.0, October 17, 2011"><span class="bold"><strong>Version 1.2.0, October 17, 2011</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>New Features:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5979" target="_top">#5979</a>
              Added chrono rounding utilities as defined By Howard Hinnant <a href="http://home.roadrunner.com/~hinnant/duration_io/chrono_util.html" target="_top">here</a>.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5978" target="_top">#5978</a>
              Added BOOST_CHRONO_HAS_PROCESS_CLOCKS to know if process clocks are
              available.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5998" target="_top">#5998</a>
              Make possible to don't provide hybrid error handling.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5906" target="_top">#5906</a>
              Take in account the constexpr as defined in the standard.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5907" target="_top">#5907</a>
              Take in account noexcept for compilers supporting it.
            </li>
</ul></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/2114" target="_top">#2114</a>
              Enable visibility support (Boost.Chorno part)
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5669" target="_top">#5669</a>
              Intel compiler failure to compile duration.hpp
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5909" target="_top">#5909</a>
              process_cpu_clock::now() on MAC gives time_points 1/1000 times.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5946" target="_top">#5946</a>
              Process real cpu clock returns the system steady clock (windows).
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5974" target="_top">#5974</a>
              Process real cpu clock should use clock() instead of times() in MAC
              which is twice faster and have better resolution.
            </li>
</ul></div>
<p>
          <span class="bold"><strong>Cleanup:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5975" target="_top">#5975</a>
              Reduce the combinations of header-only, shared, static link to reduce
              test time by 50%.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5976" target="_top">#5976</a>
              chrono_accuracy_test is not deterministic and should be removed from
              the regression tests
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5977" target="_top">#5977</a>
              Remove old files from Beman's version. Some old files included in the
              Beman's version and not documented in the reviewed version that have
              been definitely removed from the repository as
              <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem">
                    boost/chrono/timer.hpp,
                  </li>
<li class="listitem">
                    boost/chrono/process_times.hpp
                  </li>
<li class="listitem">
                    boost/chrono/detail/process_clock.hpp,
                  </li>
<li class="listitem">
                    boost/chrono/detail/mac/process_clock.hpp,
                  </li>
<li class="listitem">
                    boost/chrono/detail/posix/process_clock.hpp,
                  </li>
<li class="listitem">
                    boost/chrono/detail/win/process_clock.hpp,
                  </li>
<li class="listitem">
                    boost/chrono/detail/run_timer.hpp,
                  </li>
<li class="listitem">
                    boost/chrono/detail/run_timer_static.hpp,
                  </li>
</ul></div>
            </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_1_1_0__mars_17__2011__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_1_1_0__mars_17__2011__" title="Version 1.1.0, Mars 17, 2011"><span class="bold"><strong>Version 1.1.0, Mars 17, 2011</strong></span> </a>
</h4></div></div></div>
<p>
          <span class="bold"><strong>New Features:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/????" target="_top">#????</a>
              Added time_point unary operators +,-,++,-- and binary operators +<code class="literal">,-</code>
              with Rep al RHS.
            </li>
<li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5323" target="_top">#5323</a>
              Add Associated type difference_type for chrono::time_point.
            </li>
</ul></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
              <a href="http://svn.boost.org/trac/boost/ticket/5322" target="_top">#5322</a>
              Explicit default constructed chrono::durations are uninitialized
            </li></ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="chrono.appendices.history.__version_1_0_0__january_6__2011__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_1_0_0__january_6__2011__" title="Version 1.0.0, January 6, 2011"><span class="bold"><strong>Version 1.0.0, January 6, 2011</strong></span> </a>
</h4></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              Moved chrono to trunk taking in account the review remarks.
            </li>
<li class="listitem">
              Documentation revision.
            </li>
</ul></div>
<p>
          <span class="bold"><strong>Features:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              Boost_Chrono is now a configurable header-only library version (that
              also allows the user to choose if the <code class="computeroutput"><span class="identifier">windows</span><span class="special">.</span><span class="identifier">h</span></code>
              file is included or not).
            </li>
<li class="listitem">
              Added clock_string&lt;&gt; traits.
            </li>
<li class="listitem">
              Define chrono-io for all the clocks.
            </li>
<li class="listitem">
              Add input of process_times representation.
            </li>
</ul></div>
<p>
          <span class="bold"><strong>Implementation:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              Use of detail/win files to avoid the use of windows.h file.
            </li>
<li class="listitem">
              Completed the error_code handling.
            </li>
<li class="listitem">
              Works now with BOOST_SYSTEM_NO_DEPRECATED.
            </li>
</ul></div>
<p>
          <span class="bold"><strong>Fixes:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              Fix some warnings.
            </li>
<li class="listitem">
              Fix original errors on Mac
            </li>
<li class="listitem">
              Don't fix the link with boost_system to static.
            </li>
</ul></div>
<p>
          <span class="bold"><strong>Test:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              Added test on process and thread clocks.
            </li>
<li class="listitem">
              Moved to lightweight_test.hpp.
            </li>
<li class="listitem">
              Able to test multiple configurations.
            </li>
</ul></div>
<p>
          <span class="bold"><strong>Doc:</strong></span>
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
              Removed some not useful parts as the test and the tickets.
            </li></ul></div>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="chrono.appendices.rationale"></a><a class="link" href="appendices.html#chrono.appendices.rationale" title="Appendix: Rationale">Appendix: Rationale</a>
</h3></div></div></div>
<p>
        See <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2661.htm" target="_top"><span class="bold"><strong>N2661 - A Foundation to Sleep On</strong></span></a> which is
        very informative and provides motivation for key design decisions. This section
        contains some extracts from this document.
      </p>
<h5>
<a name="chrono.appendices.rationale.h0"></a>
        <span class="phrase"><a name="chrono.appendices.rationale.why_duration_needs_operator_"></a></span><a class="link" href="appendices.html#chrono.appendices.rationale.why_duration_needs_operator_">Why duration
        needs operator%</a>
      </h5>
<p>
        This operator is convenient for computing where in a time frame a given duration
        lies. A motivating example is converting a duration into a "broken-down"
        time duration such as hours::minutes::seconds:
      </p>
<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">ClockTime</span>
<span class="special">{</span>
    <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">hours</span> <span class="identifier">hours</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">minutes</span> <span class="identifier">minutes</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span> <span class="identifier">seconds</span><span class="special">;</span>
<span class="keyword">public</span><span class="special">:</span>
    <span class="identifier">hours</span> <span class="identifier">hours_</span><span class="special">;</span>
    <span class="identifier">minutes</span> <span class="identifier">minutes_</span><span class="special">;</span>
    <span class="identifier">seconds</span> <span class="identifier">seconds_</span><span class="special">;</span>

    <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
      <span class="keyword">explicit</span> <span class="identifier">ClockTime</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">)</span>
        <span class="special">:</span> <span class="identifier">hours_</span>  <span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration_cast</span><span class="special">&lt;</span><span class="identifier">hours</span><span class="special">&gt;</span>  <span class="special">(</span><span class="identifier">d</span><span class="special">)),</span>
          <span class="identifier">minutes_</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration_cast</span><span class="special">&lt;</span><span class="identifier">minutes</span><span class="special">&gt;(</span><span class="identifier">d</span> <span class="special">%</span> <span class="identifier">hours</span><span class="special">(</span><span class="number">1</span><span class="special">))),</span>
          <span class="identifier">seconds_</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration_cast</span><span class="special">&lt;</span><span class="identifier">seconds</span><span class="special">&gt;(</span><span class="identifier">d</span> <span class="special">%</span> <span class="identifier">minutes</span><span class="special">(</span><span class="number">1</span><span class="special">)))</span>
          <span class="special">{}</span>
<span class="special">};</span>
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="chrono.appendices.implementation"></a><a class="link" href="appendices.html#chrono.appendices.implementation" title="Appendix: Implementation Notes">Appendix: Implementation
      Notes</a>
</h3></div></div></div>
<h5>
<a name="chrono.appendices.implementation.h0"></a>
        <span class="phrase"><a name="chrono.appendices.implementation.which_apis_have_been_chosen_to_implement_each_clock_on_each_platform_"></a></span><a class="link" href="appendices.html#chrono.appendices.implementation.which_apis_have_been_chosen_to_implement_each_clock_on_each_platform_">Which
        APIs have been chosen to implement each clock on each platform?</a>
      </h5>
<p>
        The following table presents a resume of which API is used for each clock
        on each platform
      </p>
<div class="table">
<a name="chrono.appendices.implementation.clock_api_correspondence"></a><p class="title"><b>Table 7.4. Clock API correspondence</b></p>
<div class="table-contents"><table class="table" summary="Clock API correspondence">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Clock
                </p>
              </th>
<th>
                <p>
                  Windows Platform
                </p>
              </th>
<th>
                <p>
                  Posix Platform
                </p>
              </th>
<th>
                <p>
                  Mac Platform
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<td>
                <p>
                  <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a>
                </p>
              </td>
<td>
                <p>
                  GetSystemTimeAsFileTime
                </p>
              </td>
<td>
                <p>
                  clock_gettime( CLOCK_REALTIME)
                </p>
              </td>
<td>
                <p>
                  gettimeofday
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a>
                </p>
              </td>
<td>
                <p>
                  QueryPerformanceCounter and QueryPerformanceFrequency
                </p>
              </td>
<td>
                <p>
                  clock_gettime( CLOCK_STEADY)
                </p>
              </td>
<td>
                <p>
                  mach_timebase_info,mach_absolute_time
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock"><code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a>
                </p>
              </td>
<td>
                <p>
                  GetProcessTimes
                </p>
              </td>
<td>
                <p>
                  times
                </p>
              </td>
<td>
                <p>
                  times
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock" title="Class process_system_cpu_clock"><code class="computeroutput"><span class="identifier">process_system_cpu_clock</span></code></a>
                </p>
              </td>
<td>
                <p>
                  GetProcessTimes
                </p>
              </td>
<td>
                <p>
                  times
                </p>
              </td>
<td>
                <p>
                  times
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_user_cpu_clock" title="Class process_user_cpu_clock"><code class="computeroutput"><span class="identifier">process_user_cpu_clock</span></code></a>
                </p>
              </td>
<td>
                <p>
                  GetProcessTimes
                </p>
              </td>
<td>
                <p>
                  times
                </p>
              </td>
<td>
                <p>
                  times
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_cpu_clock" title="Class process_cpu_clock"><code class="computeroutput"><span class="identifier">process_cpu_clock</span></code></a>
                </p>
              </td>
<td>
                <p>
                  GetProcessTimes
                </p>
              </td>
<td>
                <p>
                  times
                </p>
              </td>
<td>
                <p>
                  times
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock" title="Class thread_clock"><code class="computeroutput"><span class="identifier">thread_clock</span></code></a>
                </p>
              </td>
<td>
                <p>
                  GetThreadTimes
                </p>
              </td>
<td>
                <p>
                  clock_gettime(pthread_getcpuclockid)
                </p>
              </td>
<td>
                <p>
                  clock_gettime(pthread_getcpuclockid)
                </p>
              </td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break">
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="chrono.appendices.faq"></a><a class="link" href="appendices.html#chrono.appendices.faq" title="Appendix: FAQ">Appendix: FAQ</a>
</h3></div></div></div>
<h5>
<a name="chrono.appendices.faq.h0"></a>
        <span class="phrase"><a name="chrono.appendices.faq.why_does_process_cpu_clock_sometimes_give_more_cpu_seconds_than_real_seconds_"></a></span><a class="link" href="appendices.html#chrono.appendices.faq.why_does_process_cpu_clock_sometimes_give_more_cpu_seconds_than_real_seconds_">Why
        does process_cpu_clock sometimes give more cpu seconds than real seconds?</a>
      </h5>
<p>
        Ask your operating system supplier. The results have been inspected with
        a debugger, and both for Windows and Linux, that's what the OS appears to
        be reporting at times.
      </p>
<h5>
<a name="chrono.appendices.faq.h1"></a>
        <span class="phrase"><a name="chrono.appendices.faq.are_integer_overflows_in_the_duration_arithmetic_detected_and_reported_"></a></span><a class="link" href="appendices.html#chrono.appendices.faq.are_integer_overflows_in_the_duration_arithmetic_detected_and_reported_">Are
        integer overflows in the duration arithmetic detected and reported?</a>
      </h5>
<p>
        <span class="bold"><strong>Boost.Ratio</strong></span> avoids all kind of overflow
        that could result of arithmetic operation and that can be simplified. The
        typedefs durations don't detect overflow. You will need a duration representation
        that handles overflow.
      </p>
<h5>
<a name="chrono.appendices.faq.h2"></a>
        <span class="phrase"><a name="chrono.appendices.faq.which_clocks_should_be_used_to_benchmarking_"></a></span><a class="link" href="appendices.html#chrono.appendices.faq.which_clocks_should_be_used_to_benchmarking_">Which
        clocks should be used to benchmarking?</a>
      </h5>
<p>
        Each clock has his own features. It depends on what do you need to benchmark.
        Most of the time, you could be interested in using a thread clock, but if
        you need to measure code subject to synchronization a process clock would
        be better. If you have a multi-process application, a system-wide clock could
        be needed.
      </p>
<h5>
<a name="chrono.appendices.faq.h3"></a>
        <span class="phrase"><a name="chrono.appendices.faq.which_clocks_should_be_used_for_watching_"></a></span><a class="link" href="appendices.html#chrono.appendices.faq.which_clocks_should_be_used_for_watching_">Which
        clocks should be used for watching?</a>
      </h5>
<p>
        For trace purposes, it is probably best to use a system-wide clock.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="chrono.appendices.acknowledgements"></a><a class="link" href="appendices.html#chrono.appendices.acknowledgements" title="Appendix: Acknowledgements">Appendix: Acknowledgements</a>
</h3></div></div></div>
<p>
        The library's code was derived from Howard Hinnant's time2_demo prototype.
        Many thanks to Howard for making his code available under the Boost license.
        The original code was modified by Beman Dawes to conform to Boost conventions.
      </p>
<p>
        time2_demo contained this comment:
      </p>
<p>
        Much thanks to Andrei Alexandrescu, Walter Brown, Peter Dimov, Jeff Garland,
        Terry Golubiewski, Daniel Krugler, Anthony Williams.
      </p>
<p>
        The file &lt;boost/chrono_io.hpp&gt; has been adapted from the experimental
        header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">chrono_io</span><span class="special">&gt;</span></code> from Howard Hinnant. Thanks for all Howard.
      </p>
<p>
        Howard Hinnant, who is the real author of the library, has provided valuable
        feedback and suggestions during the development of the library. In particular,
        The chrono_io_io.hpp source has been adapted from the experimental header
        <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">chrono_io</span><span class="special">&gt;</span></code> from Howard Hinnant.
      </p>
<p>
        The acceptance review of Boost.Ratio took place between November 5th and
        15th 2010. Many thanks to Anthony Williams, the review manager, and to all
        the reviewers: David Deakins, John Bytheway, Roland Bock and Paul A. Bristow.
      </p>
<p>
        Thanks to Ronald Bock, Andrew Chinoff, Paul A. Bristow and John Bytheway
        for his help polishing the documentation.
      </p>
<p>
        Thanks to Tom Tan for reporting some compiler issues with MSVC V10 beta and
        MinGW-gcc-4.4.0 and for the many pushing for an homogeneous <code class="computeroutput"><span class="identifier">process_cpu_clock</span></code> clock.
      </p>
<p>
        Thanks to Ronald Bock for reporting Valgind issues and for the many suggestions
        he made concerning the documentation.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="chrono.appendices.todo"></a><a class="link" href="appendices.html#chrono.appendices.todo" title="Appendix: Future plans">Appendix: Future plans</a>
</h3></div></div></div>
<h5>
<a name="chrono.appendices.todo.h0"></a>
        <span class="phrase"><a name="chrono.appendices.todo.for_later_releases"></a></span><a class="link" href="appendices.html#chrono.appendices.todo.for_later_releases">For
        later releases</a>
      </h5>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            Add User defined literals for some durations.
          </li>
<li class="listitem">
            Include chrono::date as defined by Howard Hinnant <a href="http://home.roadrunner.com/~hinnant/bloomington/date.html" target="_top">here</a>.
          </li>
</ul></div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2008 Howard Hinnant<br>Copyright © 2006, 2008 Beman Dawes<br>Copyright © 2009-2013 Vicente J. Botet Escriba<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
</div></td>
</tr></table>
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